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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/56339] [4.8 Regression]: Suboptimal register allocation
Date: Fri, 08 Mar 2013 15:51:00 -0000
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X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Keywords: missed-optimization, ra
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56339

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #7 from Uros Bizjak <ubizjak at gmail dot com> 2013-03-08 15:51:15 UTC ---
(In reply to comment #6)
> So - what regressed this compared to 4.7?  It wasn't regmove.c changes.

As said in comment 0:

gcc-4.7 generates:

f:
        addsd   %xmm2, %xmm0
        ret

gcc-4.8 generates:

f:
        addsd   %xmm0, %xmm2
        movapd  %xmm2, %xmm0
        ret